Analysis of Regional Ionosphere Model Building by Multi-GNSS

GNSS systems contain GPS,GLONASS,GALILEO and BDS etc.For the navigation users,using them together is very helpful to increase the number of the satellite that can be seen,and improves satellite distribution.So it plays a significant role in building area ionosphere model.Since GNSS systems have not been fully completed,the dual-frequency observations of GPS,GLONASS,GALILEO and BDS should be simulated,based on which the model of the ionosphere spherical harmonics is built,also the regional model results are analyzed,and some conclusion remarks are given finally.The simulation result shows that the mean accuracy of the ionosphere spherical harmonics model building by GNSS systems is better than that of single system in China.The model errors of BDS and GNSS are similar,which only account for 14% of the actual delay maximum,and better than that of GPS which is 20% maximum.While the result of GLONASS is the worst,the model error of which can even account for 35% of the actual delay.